Statistics

Question 0

Frequency distribution

Answer 0

An arrangement of data points based on how frequently they occur.

Question 1

Statistical analysis

Answer 1

Describes data and quantifies relationships between variables.

Question 2

Normal distribution

Answer 2

A frequency distribution with a symmetrical bell shaped curve.

Question 3

Central frequency

Answer 3

Measures of the center of the frequency distribution. There are three types:

1. Mode: the most frequent data point
2. Median: the middle data point
3. Mean: the arithmetic average of data points

Question 4

Variability

Answer 4

How the data are dispersed or spread around the mean.

Question 5

Range

Answer 5

The distance between the highest and lowest data point.

Question 6

Standard deviation

Answer 6

The average distance of a data point from the mean. A small SD means the scores are relatively close to the mean score; large SD means the scores have a wider range around the mean.

Question 7

Statistical significance

Answer 7

Means that the differences observed are too big to have occurred by chance.

Question 8

Type I error

Answer 8

Occur in significant testing: false positive; perceives an effect that is not there.

Question 9

Type II error

Answer 9

False negative; fails to perceive an effect that is there.